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#include <iostream>
#include <string.h>
using namespace std;
int main ()
{
int nrlit=0, nrcuv=0,nr=0;
freopen("text.in", "r", stdin);
freopen("text.out", "w", stdout);
char c;
int i=0;
while (!feof(stdin))
{
scanf("%c", &c);
if((c >= 'A' && c <= 'Z')|| (c >= 'a' && c <= 'z') )
{
nr++;
}
else
{
if(nr>0)
{
nrcuv++;
nrlit+=nr;
nr=0;
}
}
}
int x=nrlit/nrcuv;
printf("%d\n", x);
return 0;
}